1 files changed, 6 insertions, 19 deletions
diff --git a/src/mongo/db/exec/projection_node.h b/src/mongo/db/exec/projection_node.h
index cd744ef4cac..2a587580330 100644
--- a/src/mongo/db/exec/projection_node.h
+++ b/src/mongo/db/exec/projection_node.h
@@ -29,9 +29,8 @@
 
 #pragma once
 
-#include <list>
-
 #include "mongo/db/exec/projection_executor.h"
+
 #include "mongo/db/query/projection_policies.h"
 
 namespace mongo::projection_executor {
@@ -103,7 +102,7 @@ public:
     /**
      * Recursively report all paths that are referenced by this projection.
      */
-    void reportProjectedPaths(OrderedPathSet* preservedPaths) const;
+    void reportProjectedPaths(std::set<std::string>* preservedPaths) const;
 
     /**
      * Return an optional number, x, which indicates that it is safe to stop reading the document
@@ -120,7 +119,7 @@ public:
      * 'renamedPaths'. Each entry in 'renamedPaths' maps from the path's new name to its old name
      * prior to application of this projection.
      */
-    void reportComputedPaths(OrderedPathSet* computedPaths,
+    void reportComputedPaths(std::set<std::string>* computedPaths,
                              StringMap<std::string>* renamedPaths) const;
 
     const std::string& getPath() const {
@@ -129,12 +128,10 @@ public:
 
     void optimize();
 
-    Document serialize(boost::optional<ExplainOptions::Verbosity> explain,
-                       const SerializationOptions& options) const;
+    Document serialize(boost::optional<ExplainOptions::Verbosity> explain) const;
 
     void serialize(boost::optional<ExplainOptions::Verbosity> explain,
-                   MutableDocument* output,
-                   const SerializationOptions& options) const;
+                   MutableDocument* output) const;
 
 protected:
     /**
@@ -163,19 +160,9 @@ protected:
     // Writes the given value to the output doc, replacing the existing value of 'field' if present.
     virtual void outputProjectedField(StringData field, Value val, MutableDocument* outDoc) const;
 
-    // Used to determine if the node is an inclusion or exclusion node.
-    virtual bool isIncluded() const = 0;
-
     StringMap<std::unique_ptr<ProjectionNode>> _children;
     StringMap<boost::intrusive_ptr<Expression>> _expressions;
-
-    // List of the projected fields in the order in which they were specified.
-    std::list<std::string> _projectedFields;
-
-    // Set of projected fields. Note that the _projectedFields list actually owns the strings, and
-    // this StringDataSet simply holds views of those strings.
-    StringDataSet _projectedFieldsSet;
-
+    StringSet _projectedFields;
     ProjectionPolicies _policies;
     std::string _pathToNode;